Halvorsen is a Norwegian patronymic surname. Notable people with the surname include:
- Aasmund Halvorsen Vinje (1851–1917), Norwegian politician for the Liberal Party
- Andreas Halvorsen (golfer), Norwegian golfer
- Asbjørn Halvorsen (1898–1955), Norwegian footballer.
- Birger Halvorsen (1905–1976), Norwegian high jumper
- Einfrid Halvorsen, Norwegian politician for the Labour Party
- Gail Halvorsen (1920–2022), American command pilot
- Gunnar Halvorsen (1945–2006), Norwegian politician for the Labour Party
- Harald Halvorsen (disambiguation), multiple people
- Håvard Halvorsen, Norwegian football defender
- Hjalmer S. Halvorsen (1884–1970), American politician
- Jan Halvor Halvorsen, Norwegian football manager
- Johan Halvorsen (1864–1935), Norwegian composer, conductor and violinist
- Johan Magnus Halvorsen, Norwegian politician for the Liberal Party
- John Halvorsen, Norwegian long-distance runner
- Katherine Halvorsen, American statistician
- Kathy Halvorsen, American environmental scientist
- Kristin Halvorsen, Norwegian socialist politician
- Lars Halvorsen Sons, boat builders
- Mette Halvorsen, Norwegian curler
- Otto Bahr Halvorsen (1872–1923), Norwegian politician from the Conservative Party
- Seth Halvorsen (born 2000), American baseball player
- Stian Lind Halvorsen, Norwegian football defender
- Tor Halvorsen (1930–1987), Norwegian trade unionist and politician for the Labour Party
- Tordis Halvorsen (1884–1955), Norwegian actress
- Tore Halvorsen, Norwegian entrepreneur and CEO of FMC Technologies
- Trond Halvorsen Wirstad (1904–1985), Norwegian politician for the Centre Party
- Trygve Halvorsen, Norwegian chess player
- Sigurd Halvorsen Johannessen (1881–1964), Norwegian acting councillor of state